Shopify has made an investment in Klaviyo ... Klaviyo now is the recommended email solution for Shopify Plus customers globally. Klaviyo is a powerful marketing platform that helps eCommerce store owners deliver a more personalized experience for their customers. Results speak for themselves - Klaviyo has helped brands across the world make more than $3.7 billion in revenue in the last year alone. [unclear if this is incremental or just the size of the sales base they serve]